名词
中文翻译：保留费用
同义词：
['maintenance fee', 'maintenance charge']
例句：
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1.The hotel charges a $500 retaining fee for the first night.
酒店在头一晚收取500美元的保留费。
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2.The construction company will be responsible for any retaining fees incurred during the project.
建筑公司将负责项目期间产生的任何保留费用。
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3. The client agreed to pay the retaining fee before the work was completed.
客户同意在工程完成前支付保留费。